Air-brake.



R. D. BUSWELL, AIR BRAKE. APPLICATION FILED NOV-15. 1912.

Patented Oct. 7, 1913.

2 SHEETS-BEEET1 Inventor Attorneys COLUMBIA WRAP GOqV/ASHING QN. D. C.

R. D. BUSWELL.

AIR BRAKE. APPLICATION rmm Nov. 15. 1912.

' Patented Oct. 7, 1913.

2 BHEBTS8HBET 2.

, I EYIII/II/IIIII/I/l nventorby 1 I v I o Attorneys COLUMBIA PLANDuRAPl-l CD.,WASHINU10N. D. c.

ROBERT D. BUSWELL, WELLINGTON, KANSAS.

AIR-BRAKE.

Specification of Letters Patent.

Patented Oct. '7, 1913.

Application filed November 15, 1912. Serial No. 731,640.

To all whom it may concern Be it known that I, ROBERT D. BUswELL, a citizen of the United States, residing at Wellington, in. the county of Sumner and State of Kansas, have invented a new and useful Air-Brake, of which the following is a specification.

The present invention relates to improvements in air brake systems, and more particularly to an automatic device for re leasing auxiliary reservoir pressure when the triple valve piston from any reason sticks or fails to move when the brakes are being released.

In practice, after the brakes have been set and the pressure in the train pipe reduced, and it is desired to release the brake, pressure is restored in the train pipe and the triple valve is operated to cut off the supply to the brake cylinder. In some cases the triple valve piston fails to move and consequently the brake upon the car holds and produces fiat wheels and worn brake shoes. In ordinary practice, it has been demonstrated that a slight bleeding or venting of the auxiliary reservoir will release the piston and permit it to move to prevent the air entering the brake cylinder, and it is therefore the intention of the present applicant to provide an automatic device dependent upon the movement of the triple valve piston and the increasing pressure during the releasing of the brakes, that will automatically, when necessary and when the piston is stuck or sluggish, act to release the pressure or bleed the auxiliary reservoir, the same being restored to normal position as soon as the pressure is released and the triple valve piston moved by the pressure upon the opposite side.

With the foregoing and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings-Figure l is a side elevation of a combined auxiliary reservoir and brake cylinder with the present device in operable relation thereon. Fig. 2 is an enlarged detail sectional view through one end of a triple valve casing showing the triple valve piston in brake application position and when pressure fluid is admitted to the automatic venting device. Fig. 3 is a section taken on line 3-3 of Fig. 2. Fig. 3* is a view illustrating the position of the check and hand valves in the conduit. Fig. 4 is a perspective view of the slide valve carried by the triple valve piston. Fig. 5 is a longitudinal sectional view through the bleeding valve and its operating mechanism, the parts being in normal position. Fig. 6 is a similar vlew with the valve in bleeding or venting position.

Referring to the drawings, the numeral 1 designates the auxiliary reservoir, which is here shown as connected directly to the brake cylinder 2 and constituting the mechanism usually employed upon freight cars, although it is to be understood, that the present invention is readily applicable to the passenger auxiliary reservoirs and brake cylinders of any construction and character in general use.

The triple valve casing 3 is indicative of any form of triple valve and, all of the respective parts are of usual construction, the present invention as will presently appear being readily applied to any form to accomplish the automatic bleeding or venting of the auxiliary reservoir 1. v

The triple valve casing is provided with the usual triple valve piston chamber 4, in which is mounted the piston 5 of usual construction, and detachably connected so as to practically seal the outer end of the chamber 4 is the cap 6 of the casing. This cap 6 carries the rim or annular portion 7 which is provided with the usual opening 8, the walls of which are circular and of usual construction. Formed in the lower portion of the wall and leading from the opening 8 is a duct or channel 9, the same being so c isposed as to permit of the proper operation of the various parts of the triple valve and constituting one of the auxiliary features which are readily formed in the triple valves now used, it simply being necessary to bore the channel from the outside of the cap 6 through the ring or wall 7 and then downwardly from the wall of the aperture 8, so as to provide a means whereby the air followingthe course of the arrows as indicated in Fig. 2 will enter the channel 9, the purposeof which will presently appear.

In order to control the admission of the pressure to the duct or channel 9, the slide valve 10, as clearly shown in detail in Fig.

full line position as shown in- Fig. 2, the said slot will be above the duct 9' so thatalr pressure admitted into the end Got the casing will pass into the said duct 9 and be carried through the conduit 14: to the air chamher 16 of the automaticventing device, as will presently appear. l/Vhen the triple valve piston 5is in its normal position, that isin dotted "line position, Fig. 2, the brake being released, the solid outer end of the valvelO will be above the inlet end of the duct 9 and thereby prevent theadmission of any air into the duct and finally into the chamber 16. If, however, the piSt0n5'Sl10ulCl beheld at any position, whereby the same will'not assume the dotted line'position as shown in Fig. 2, during the=releasing and at the time the brake should be released, the slot 13 will permit the entrance of air into the'duct-9 so that the admission of air into such duct "9 is-entirely controlled by the position of the triple valve piston between the time of setting and releasing the brake.

As clearly shown in Figs. 1, 3 and 3 a spring closed valve 15 is mounted in the inletend of the conduit 14 to control the flow of air to the air chamber16, said-air chamber 16 being mounted upon the auxiliary reservoir 1 in any desired manner, and said valve 15 has its spring so regulated or tensioned, as to remain closed until forced open by a predetermined pressure, in, general practice being from 66 to pounds to the square inch.

The chamber 16 is provided with the enlarged intermediate portion 16", in which is slidably mounted the valve actuating iston 17, the said piston 17 being limite in its movement by the length of the chamber 16* and the shoulders at the respective ends thereof, while connected concentrically to the piston and extending outwardly and through the spring chamber 20 is the rod 18, the said piston 17 and rod 18 being held in the post-ion as shown in Fig. 5 and under normal conditions by means of the sprin 19. Mounted upon the other end of the rod 18 is a: disk valve 21, which is mounted in the valve casing 22 having the vent port 23, which under normal conditions is closed by the valve 21, as shown in Fig. 5, so that the auxiliary reservoir pressure is maintained and no leakage is permitted through the bleeding conduit-25 from the port 24 which 'mately 66 -p0unds,the valve 15 will be leads into the valve casing '22. This bleeding conduit is provided at its upper end with the reduced nozzle 26 with the manually operated bleeding valve 27, the form herein shown being merely shown as indicative of any devlce whereby the conduit 25 may be manually. vented.

The air chamber 16 is provided with the small vent port 16, so that when the piston 17 is returned by the spring 19 from the position shown in'Fig. 6 to that shown in Fig. 5, by means of the spring 19,'the air trapped within the chamber 16 will be forced out of the small vent 16 which is of lesser diameter than the inlet from the conduit 14. r 1 v A hand valve 15 is mounted in the conduitlt, so that should the automatic vent be out of order, the flo'wof air conduit 14 may be prevented.

From the foregoing description, taken in through the connection with the drawings the operation of the present device 1s readily understood,

but briefly stated it is as follows: Assuming that the brakes have been set, and the -'enair'will be admitted into-the-duct 9 and 7 through the conduit 14:, butasthe pressure has not reached the predetermined amount, in practice being from 66110 70 pourids to the square incln'fthevalve 15 is held closedby means of its spring 15,' but as soon as the pressure -'has been increased to approxiopened and air pressure will be admitted into the air chamber 16. This action will cause the piston 17 to be moved from'the positionshown in Fi'g. 5- to that shown in Fig. 6, unseating the disk valve 21 from the -port23 or in the position as shown in Fig. 6, so that the air pressure within the reservoir, which has been holding the sluggish or stuck triple valve piston 5' against-11lovement to the left-as shown in Fig.2, will be released from the reservoir through the ports 23 and 24, and from the left side of the triple valve piston -5. The pressure at the left of the triple valve piston 5 now being reduced, and being overcome by the pressure; in the casing 6 to the right of the piston 5,will cause the piston 5' to be moved to the left to assume the dotted line position ofFig. 2,'the piston 5 having caused the slidevalve of the triple valve to connect the brake cylinder to the atmosphere and at the same time place the solid portion of the slide valve 10 over the inlet end'of the duct "gineman isabout to release the same, the

9,-so' that the pressure will be cut off from v the conduit 14 and consequently the air chamber 16. Asthe object desired has been accomplished inthis action, and as the air pressure is reduced in the chamber 16, the air will vent through the port 16 and the spring 19 will now move the piston 17 from the position shown in Fig. 6 tothat shown in Fig. 5 so that the port 23 will be again closed to prevent further venting of the auxiliary reservoir It will. thus be seenthat with the device as herein set forth, that "the various individual auxiliary reservoirs and triple valves may be readily equipped and that without the necessity of manual operation as is the present practice in releasing the triple valve pistons, each triple valve piston will automatically control the supply of air to the chamber 16 which in turn when the valve 15 has been operated will automatically operate theventing valve 21 so that the return of the triple valve piston 5 to its normal position when the brakes are released will be assured, and thus the flattening of wheels and the wearing of brake shoes is avoided.

What is claimed is:

1. In an air-brake system, the combination with an auxiliary reservoir, a brake cylinder, a train pipe, and a triple valve, of an automatic means for releasing pressure in the auxiliary reservoir to release a sluggish triple valve piston after the setting of the brakes and during the release thereof, said means being operably connected to the triple valve piston and the auxiliary reservoir, and said means operating when the triple valve piston refuses to operate up to a predetermined pressure to release the pressure in the auxiliary reservoir and permit the piston to move to brake cylinder released position.

2. The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automaticallyventing the auxiliary reservoir controlled by the triple valve piston.

8. The combination with anauxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automatically venting the auxiliary reservoir controlled by the triple valve piston,.said means including a pneumatic and spring actuated vent valve for the auxiliary reservoir, and a valve connected to and controlled by the triple valve piston for controlling the supply of air to the pneumatic and spring actuated vent valve.

4:. The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triplevalve, of means for automatically venting the auxiliary reservoir controlled by the triple valve piston, said means including an air chamber, a spring'operated piston mounted therein, a venting valve for the auxiliary reservoir connected to the piston and held closed by the spring, and means controlled by the triple valve piston for supplying air to the chamber to operate the piston and open the vent valve.

1 5. The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automatically venting the auxiliary reservoir controlled by the triple valve piston, said means including an air chamber, a spring operated piston mounted therein, a venting valve for the auxiliary reservoir connected to the piston and held closed by the spring, a conduit leading from the triple valve casing to the air chamber, a valve in said conduit constructed to operate at a predetermined pressure before admitting air to the air chamber, and a valve operated by the triple valve piston to control the supply of air through the conduit. 7

6. The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automatically venting the auxiliary reservoir controlled by the triple valve piston, said means including an airehamber, a spring operated piston mounted therein, a venting valve for the auxiliary reservoir connected to the aiston and held closed by the spring, a con uit leading from the triple valve casing to the air chamber, a spring closed valve in said 95 conduit to control the admission of air to the air chamber and operable to open at a predetermined pressure, ancl a valve operated by the triple valve piston for controlling the supply of air to the conduit. 7

7 The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automatically venting the auxiliary reservoir controlled by the triple valve piston, said means including an air chamber, a spring operated piston mounted therein, a venting valve for the auxiliary reservoir connected to the piston and held closed by the spring, a conduit leading from the triple valve casing to the air chamber, a spring closed valve in said conduit to control the admission of air to the air chamber and operable to open at a predetermined pressure, and a slide valve operated by the triple valve piston for controlling the supply of air to the conduit.

8. The combination with an auxiliary reservoir, a train pipe, a brake cylinder, and a triple valve, of means for automatically venting the auxiliary 'reservoir controlled by the triple valve piston, said means including an air chamber, a spring operated piston mounted therein, a venting valve for the auxiliary reservoir connected to the piston and held closed by the spring, said air chamber being in communication with the triple valve casing, and a valve operated-by the triple valve piston for controlling the supply of air to the air chamber.

9. The combination with an auxiliary reservoir, atrain pipe, a'brake cylinder, and. a-tripleivalve, of-means for automatically venting the auxiliary reservoir controlled by the-triple valve piston, said meansineluding an air chamber, a spring operated piston mounted therein, a venting valve for the'auxiliary reservoir connected to the piston and held closed by the-spring, said air chamber having an inlet in communication with the triple valve, a valve in said inlet and operable to open ata predetermined pressure to admit pressure to theair chamher, and a valveoperated by the triple valve piston for controllin the passage of the air pressure from the triple valve casing to the airchamber inlet.

10. In an air-brake system, the combination with an auxiliary reservoir provided with a valve controlled vent, a brake cylinder, a; triple valve, and. a-train pipe, of meansvfor automatically controlling the vent valve from the pressure in the triple valve casing, said means, including a conduit lead ing from the triple valve asing, a valve conneoted' to and carried byitheltriplevalve piston for controlling theisupply-of pressure to the conduit, a cylinder including a n;air chamber, a piston chamber and a'spring chamber, a piston mounted therein'and con-i nected to the vent valve of the auxiliary reservoir, a spring mounted in the spring chamber for holding the piston and'valve closed, said conduit leading from thetriple valve casing being connected to the air Witnesses G. B. STEEL, Y LEWIS G. BELL.

Copies of this patent maybe obtained for m; cents each, by addressing the Commissioner of Patents,

Washingt ROBERT in BUSWERLLZI f 

